<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表单初级验证</title>
</head>
<body>
<form action="iframe内联框架.html" method="get">
  <p>name:
    <input type="text" name="username" placeholder="用户名提示消息" required>
  </p>
  <p>password
    <input type="password" name="password" placeholder="密码提示消息" required>
  </p>

  <p>email
    <input type="email" name="email" required>
  </p>

  <p>
    <input type="submit" name="提交">
    <input type="reset" name="重置">
  </p>
</form>
</body>
</html>